CVE-2026-46521
Undergoing Analysis Undergoing Analysis - In Progress
Out-of-Bounds Write in ImageMagick via LZMA Compression

Publication date: 2026-06-10

Last updated on: 2026-06-11

Assigner: GitHub, Inc.

Description
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-48 and 7.1.2-23, when using LZMA compression in the MIFF encoder an out of bounds write can occur due to a missing check. This issue has been patched in versions 6.9.13-48 and 7.1.2-23.
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Meta Information
Published
2026-06-10
Last Modified
2026-06-11
Generated
2026-06-11
AI Q&A
2026-06-11
EPSS Evaluated
N/A
NVD
CVE-2026-46521
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
imagemagick imagemagick to 6.9.13-48|end_excluding=7.1.2-23 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
CWE-835 The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
CWE-131 The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
CWE-252 The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.
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Executive Summary

This vulnerability exists in ImageMagick, a free and open-source software used for editing and manipulating digital images. Specifically, prior to versions 6.9.13-48 and 7.1.2-23, when using LZMA compression in the MIFF encoder, an out of bounds write can occur due to a missing check.

An out of bounds write means that the software writes data outside the allocated memory buffer, which can lead to unpredictable behavior or crashes.

This issue has been fixed in versions 6.9.13-48 and 7.1.2-23.

Impact Analysis

The vulnerability can impact you by causing an out of bounds write when processing images with LZMA compression in the MIFF encoder, which may lead to application crashes or instability.

According to the CVSS v3.1 score of 5.5 with an attack vector of local and low privileges required, the impact is primarily on availability (A:H), meaning it can cause denial of service or disruption of service.

There is no direct impact on confidentiality or integrity.

Mitigation Strategies

To mitigate this vulnerability, update ImageMagick to version 6.9.13-48 or later, or version 7.1.2-23 or later, where the issue has been patched.

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